On Tue, 17 Feb 2004, Saint Aardvark the Carpeted wrote: > Jack L. Stone disturbed my sleep to write: > > This would be the steps: > > - grep(1) the new string and pipe to sed(1) ..?? > > - sed(1) to find the old string & replace with the new string in a file. > > Am I on the right track....?? > > I think so, yeah -- something like this should work: > > #!/bin/sh > > new=`grep foo /path/to/bar` > old=`cat /path/to/oldvariable` > > sed -i.bak -e "s/$old/$new/" /file/to/edit > > Note that I'm using double quotes (") rather than the single quotes (') > you usually see with sed scripts; that's so I can use $newvariable > and still have the varible substituted in. This assumes there's nothing > in $old or $new that would need to be escaped (quotes, slashes, etc). > Also, my simplistic example for grep and cat assumes that the product of > each is the thing you need to search/replace and nothing else -- if you > need the third field (say), look at awk(1). The "-i" option tells sed > to edit the file in place, but keep a backup named "/file/to/edit.bak". > > Another, and maybe more robust approach, to editing the file would be to > try Perl, Programming Language of the Elder Gods. (Yeah, I'm a fan. :-). > The last line could be replaced by: > > perl -i.bak -new="$new" -old="$old" -e's/$old/$new/' \ > /file/to/edit > > ...which would be a way of getting difficult values of new and old into > single quotes. > > HTH, > Hugh
Hugh: Thanks for the reply. This gives me two interesting approaches which should do the job. Appreciate it..... _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"